linux-kernel - Re: [PATCH 19/43] x86/entry/64: Remove the SYSENTER stack canary

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Message-ID: <20171125152939.fake3rrmyy52bfe5@pd.tnic>
Date:   Sat, 25 Nov 2017 16:29:39 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...capital.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 19/43] x86/entry/64: Remove the SYSENTER stack canary

On Fri, Nov 24, 2017 at 06:23:47PM +0100, Ingo Molnar wrote:
> From: Andy Lutomirski <luto@...nel.org>
> 
> Now that the SYSENTER stack has a guard page, there's no need for a
> canary to detect overflow after the fact.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Borislav Petkov <bpetkov@...e.de>
> Cc: Brian Gerst <brgerst@...il.com>
> Cc: Dave Hansen <dave.hansen@...el.com>
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Link: https://lkml.kernel.org/r/be3179c0a38c392fa44ebeb7dd89391ff5c010c3.1511497875.git.luto@kernel.org
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> ---
>  arch/x86/include/asm/processor.h | 1 -
>  arch/x86/kernel/dumpstack.c      | 3 +--
>  arch/x86/kernel/process.c        | 1 -
>  arch/x86/kernel/traps.c          | 7 -------
>  4 files changed, 1 insertion(+), 11 deletions(-)

Nice.

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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